-7-9(-4-2B)B=4

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Solution for -7-9(-4-2B)B=4 equation:


Simplifying
-7 + -9(-4 + -2B) * B = 4

Reorder the terms for easier multiplication:
-7 + -9B(-4 + -2B) = 4
-7 + (-4 * -9B + -2B * -9B) = 4
-7 + (36B + 18B2) = 4

Solving
-7 + 36B + 18B2 = 4

Solving for variable 'B'.

Reorder the terms:
-7 + -4 + 36B + 18B2 = 4 + -4

Combine like terms: -7 + -4 = -11
-11 + 36B + 18B2 = 4 + -4

Combine like terms: 4 + -4 = 0
-11 + 36B + 18B2 = 0

Begin completing the square.  Divide all terms by
18 the coefficient of the squared term: 

Divide each side by '18'.
-0.6111111111 + 2B + B2 = 0

Move the constant term to the right:

Add '0.6111111111' to each side of the equation.
-0.6111111111 + 2B + 0.6111111111 + B2 = 0 + 0.6111111111

Reorder the terms:
-0.6111111111 + 0.6111111111 + 2B + B2 = 0 + 0.6111111111

Combine like terms: -0.6111111111 + 0.6111111111 = 0.0000000000
0.0000000000 + 2B + B2 = 0 + 0.6111111111
2B + B2 = 0 + 0.6111111111

Combine like terms: 0 + 0.6111111111 = 0.6111111111
2B + B2 = 0.6111111111

The B term is 2B.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2B + 1 + B2 = 0.6111111111 + 1

Reorder the terms:
1 + 2B + B2 = 0.6111111111 + 1

Combine like terms: 0.6111111111 + 1 = 1.6111111111
1 + 2B + B2 = 1.6111111111

Factor a perfect square on the left side:
(B + 1)(B + 1) = 1.6111111111

Calculate the square root of the right side: 1.269295518

Break this problem into two subproblems by setting 
(B + 1) equal to 1.269295518 and -1.269295518.

Subproblem 1

B + 1 = 1.269295518 Simplifying B + 1 = 1.269295518 Reorder the terms: 1 + B = 1.269295518 Solving 1 + B = 1.269295518 Solving for variable 'B'. Move all terms containing B to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + B = 1.269295518 + -1 Combine like terms: 1 + -1 = 0 0 + B = 1.269295518 + -1 B = 1.269295518 + -1 Combine like terms: 1.269295518 + -1 = 0.269295518 B = 0.269295518 Simplifying B = 0.269295518

Subproblem 2

B + 1 = -1.269295518 Simplifying B + 1 = -1.269295518 Reorder the terms: 1 + B = -1.269295518 Solving 1 + B = -1.269295518 Solving for variable 'B'. Move all terms containing B to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + B = -1.269295518 + -1 Combine like terms: 1 + -1 = 0 0 + B = -1.269295518 + -1 B = -1.269295518 + -1 Combine like terms: -1.269295518 + -1 = -2.269295518 B = -2.269295518 Simplifying B = -2.269295518

Solution

The solution to the problem is based on the solutions from the subproblems. B = {0.269295518, -2.269295518}

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